Gas-engine.



F4l WOMIVIER.

GAS ENGINE.

APPLICATION FILED JUNE I. 1911.

IN VENTOR.' F RE DE C FREDERIC WOMIVIER, MINNEAPOLIS,

JOSEPH J'. IBARGLAY, OF

MINNEAPOLIS, MINNESOTA.

ANT FFIGE,

MINNESOTA., ASSIGNOR OF ONE-HALF TO GAsENGINn.

To all whom i may concern.' l

vBe it known that I, FREDERIC WOMMER,

. a citizen of the United States, resident of inneapolis, county of Hennepin, State of Minnesota, have 'invented certain new and useful Improvements in Gas-Engines, of which the following is a specification.

The object of my invention is toprovide a gas engine in which the valves usually employed in the intake and exhaust ports are entirely eliminated.

A further object is toprovide a gas engine comprising a minimum of parts and hence comparatively inexpensive to manufacture ar d maintain.

A further object is to provide a gas engine which while capable of a variety of uses orpurposes, is on account of its simplicity and inexpensive construction, particularly adapted for miniature purposes.

The invention consists generally in various constructions and combinations, all as hereinafter described and particularly pointed out in theI claim.

In the accompanying drawings forming part of this specification,

Figure l is a vertical sectional view of a gas engine embodying my invention, showing the piston in position for admitting a fresh charge of gas to the cylinder,

Fig. 2 is asimilar view, showing the piston at the end of the compression stroke,

Fig. 3 is a view corresponding to Fig. 2, showing the explosion chamber of the cylinder open to the exhaust,

Fig. 4 illustrates a continuation ofthis stroke, with the exhaust closed forming a i vacuum in the cylinder and the piston about to open up the intake passage to admit a fresh charge to the cylinder.

In .the drawing, 2 represents a crank case having a crank shaft 3 therein provided with a connecting rod 4 attached to a piston 5 that is mounted to slide in a cylinder 6. The piston is hollow and has a diagonal wall 7 therein forming a chamber 8 `which leads to an exhaust port 9 located in the wall of the piston adjacent to the middleportion thereof. The chamber 8 gradually decreases in cross sectional area toward the exhaust port 9 and any burned gases which may be present in this chamber prior to the compression stroke will be insuiiicient to afect the fresh charge of gas entering' the cylinder.

d10 is `an intake port threaded for connec- Specication of Letters Patent. Aipplication filled J'une 1,

Patented Mar. 4l, 19M?,

1917. seria11vo.172,140.

tion with a gas intake pipe and ll the exhaust port in the opposite wall ofthe cylinder. 12 is a spark plug of ordinary construction, mounted in a removable cylinder head 13. The intake and exhaust ports are so positioned in the wall of the cylinder that when the piston is at its lowest point and the connecting rod 4 is passing the center'ofthe crank shaft, the port 10 through which the gas charge is admitted to the cylinder will be opened and the gas will flow through this port into the explosion chamber of the cylinder. As the revolution of the crank shaft continues, the piston will be moved upwardly upon half a revolution of the crank shaft to the position shown in Fig. 2, where the charge will be compressed and ignited. The connecting rod passing the center of the shaft on the upper side will be forced downwardly through the explosion in the cylinder and when the shaft has made a quarter of a revolution, the portV 9 in the piston will register with the exhaust port 1l and the burned gases in the cylinder will be allowed to exhaust. The downward movement of the piston will continue, as shown in Fig. 4, cutting' off the exhaust passage and soon after this passage is closed, the gas intake port l0 will `be opened and the gas will flow into the cylinder to ll the vacuum created by the continued downward motion of the piston caused by the explosion. The momentum of the downward movement of the piston will be suiicient to carry the connecting rod past the center of the crank shaft, so that the piston will be returned in the cylinder to compress the gas and close the intake port and produce an explosion in the engine cylinder and repeat the operation so long as fuel gas is supplied to the cylinder, all without the use or care of valves usually employed with engines of this type.

The piston is of sufficient length so that the intake port will be fully covered at the end of the compression stroke, otherwise there might be a waste of gas if supplied to the intake port under pressure.

It will be observed that the piston is, of uniform diameter and also of equal and uniform length throughout its peripheral wall, making it economical to manufacture. Furthermore the entire cross sectional area of the piston head is exposed to the action of the expanding fluid, and on account of the sha e of the chamber 8, the lateral pressure of tie fluid is equalized in every direction, or, in other words, the piston is pressure balanced laterally, resulting in even and uniform wear and also uniform lubrication.

The engine may be made in various sizes, and modifications may be made in the details of construction and still be within the scope of my invention.

, I claim as my invention:

ln an internal combustion engine, a cylinder, a piston of uniform diameter and of uniform len h throughout its peripheral Wall Working in said cylinder and formed with an exhaust port in the side Wall thereof, said piston having a deeply sloping internal wall which forms the piston head and provides a. piston combustion chamber in open communication with the combustion Chamber of the cylinder, said ber decreasing in cross-sectional area toward and connnunicating with said piston exhaust port, an inlet port in the cylinder Wall adapted to oe overrun by the piston near the end of the Working stroke, and an exhaust port in the cylinder Wall adapted to register with the piston exhaust port at approximately the medial point of the piston travel.

In Witness whereof I have hereunto vset my hand this 22d day of May, 1917 FREDERIC vvoMMER.

piston chamy 

